Bug 5912: TableSlot column units not handled correctly adding/deleting columns
Bug Number: 5912
Release notes (y/n): not yet
For Release Nums: 7.0.6

STILL NEEDS TESTING

Gnats 5912: Inserting columns in table slots with different units 
  messes up the units on the existing columns.

Not fully tested fixes for this and related Table Slot column change bugs:

(1) TableSlot::insertColumn (int) wasn't adjusting column units starting
    at the deleted column.

(2) Deleting a column from a table slot also wasn't adjusting column units.
    See changes in TableSlot::deleteColumn (int).

(3) Deleting a column from a TableSlot (e.g. a Periodic Slot) having a 
    "column map" (NumericDimension) had been just truncating the column map 
    instead of removing the deleted column's item from the column map.
    See changes in TableSlot::deleteColumn (int) and deleteLastColumn().

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